a powerfull sword with lightning force to attack, when you use this sword you’ll be able to move by your self to defence or attack automaticly. (used by minamoto musashi (Doraemon and nobita give it to him in the short story)
Air cannon (空気砲, Kūkihō?)
A gun barrel worn on the arm used to fire a powerful burst of air which can knock out the victim when the user says “bang”. Later models, featured in the long manga and movies, are fired with a trigger.